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Re-read the following article and answer the questions that follow. By studying stars of different ages, we have learned that the early universe contained only the simplest chemical elements hydrogen and helium (and a trace amount of lithium). We and the Earth are made primarily of “other” elements, such as carbon, nitrogen, oxygen, and iron. Where did these other elements come from? Astronomers have discovered that all of these elements were manufactured by massive stars. . . In summary, most of the material from which we and our planet are made was created inside stars that died before the birth of our Sun. We are intimately connected to the stars because we are products of stars. In the words of astronomer Carl Sagan, we are “star stuff.” (Adapted from Bennett, Donahue, Schneider, and Voit, The Cosmic Perspective, pp. 6, 8) What is the topic of this selection?

In Neolithic farming communities, the primary social unit was

Name this black structure.

Which three main physical traits came to distinguish humans from apes and other primates?

Consider the organ indicated by the arrow and its orientation in the body. What quadrant is this organ contained within?

Oral candidiasis, commonly called thrush, is a ________ infection of the mouth   _______

The name for the posterior “pointy portion” of the elbow is the _____area.

What is the name of the structure indicated that is beneath the stage?

Oxygen and CO2 crosses a plasma membrane _____

Neanderthals comparatively large teeth allowed them to